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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b986d892225924f59e05ce56107e36154b286b7f48f8885515afdb1f38af15e' 
  AND token = 'tlkXt+nu3TrE5OXe3P10q1BAPlCqWXdTbQjOHrr9iSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}